User Manual
Z-SG2 / Z-SG2-L
ALL RIGHTS RESERVED. NO PART OF THIS PUBLICATION MAY
BE REPRODUCED WITHOUT PRIOR PERMISSION.
www.seneca.it
Doc: MI-005370-EN
Rev. 1.0.0.2
Page 11
LOAD CELL CONNECTION
SIGNAL
TERMINAL
No.
MEANING
+Excitation
7
Cell supply (+)
+Sense
8
Reading of the supply to the cell (+)
+Signal
9
Load cell signal (+)
- Signal
12
Load cell signal (-)
- Sense
11
Reading of the supply to the cell (-)
- Excitation
10
Cell supply (-)
CHECKING THE LOAD CELL OPERATION
Before starting the configuration of the device it is necessary to verify the correctness of the wiring and the
integrity of the load cell.
CHECKING CABLES WITH A DIGITAL MULTIMETER
First you need to check with the load cell manual that there are about 5V DC between the +Excitation and –
Excitation cables. If the cell has 6 wires check that the same voltage is also measured bSense and –
Sense.
Now leave the cell at rest (without the tare) and check that the voltage between the +Signal and –Signal
cables is around 0 V.
Now unbalance the cell by applying a compression force, checking that the signal increases until it reaches the
full scale (if possible) where the measurement will be approximately:
5* (cell sensitivity) mV.
For example, if the declared cell sensitivity is 2 mV/V, 5 * 2 = 10 mV must be obtained.
In the case of bipolar measurement only (compression/traction) it is necessary to completely unbalance the
cell even in traction, in this case the same value must be measured between the +Signal and –Signal cables
but with the negative sign:
-5* (cell sensitivity) mV.
CONNECTION OF MORE LOAD CELLS IN PARALLEL
It is possible to connect up to a maximum of 8 load cells (and in any case without ever falling below the
minimum 87 Ohms). It is therefore possible to connect:
